Comments

This patch give the user different methods to disable
the attachment of helper to all connections on a given
port. The idea is to allow the user to choose with the CT target
the helper assignement he wants to have.
First method it to use the 'no_helper_assign' option on the
nf_conntrack module. As this is a constraint to do this at the time
of the loading, a /proc entry is also available.
Setting sys/net/netfilter/nf_conntrack_no_helper_assign to 1 will
disable the automatic assignement of the helper. The user will
---
include/net/netfilter/nf_conntrack_helper.h | 3 +
include/net/netns/conntrack.h | 2 +
net/netfilter/nf_conntrack_core.c | 6 ++
net/netfilter/nf_conntrack_helper.c | 79 ++++++++++++++++++++++++++-
4 files changed, 88 insertions(+), 2 deletions(-)